The two largest planets in our solar system are coming closer together than they have been since the Middle Ages, and it"s happening just in time for Christmas - hence the nickname of the “Christmas Star”.

While it’s not an actual star, the two planets will certainly make a bright splash in the night sky.

On the night of December 21, the winter solstice, Jupiter and Saturn will appear so closely aligned in our sky that they will look like a double planet. This close approach is called a conjunction. The fact that this event is happening during the winter solstice is pure coincidence, according to NASA.

If you’re a stargazer, you’ve likely noticed Jupiter and Saturn have been getting closer together since the summer. And they"re currently visible in our night sky, inching ever closer to one another.

Between December 16 and 25, they will become even cozier. Look for the Jupiter-Saturn conjunction low in the western sky for about an hour after sunset each evening during this time.